Some recent incidents involving children falling out of buses may cause concern for parents.

In Arkansas, bus video captured a four-year-old girl swinging out the back door of a church bus on a highway. She is recovering from her injuries.

In South Carolina, an 8-year-old boy fell out of the side emergency door of a school bus. He walked away with only minor injuries. The school district said students accidentally hit a door mechanism, which forced open the door.

Here in Iowa, the emergency escape windows on school buses have a toggle on the handle. If someone moves it, an alarm will go off. That alarm will sound before the window swings open, and the driver will immediately and safely stop the bus.

Iowa State Patrol Trooper Jon Stickney made note of the students on the bus in the South Carolina accident. Several were standing up and out of their seats while the bus was moving.

"Once those students get out their seats and start horsing around and not doing what they're supposed to do by the rules of the bus, now anything can happen," said Stickney.

Staying in the seats is something school officials stress to students in the West Delaware school district."We do evacuation trainings twice per year with every student in the district," said West Delaware transportation director Gary Fonck.

For students at West Delaware, it's not a matter of if a bus crash happens, but rather, when the bus crash did happen.

"The older students helped the younger students out the back of the bus. The bus driver knew exactly what he was supposed to do. And because of that, we had minor injuries," said Fonck.

On October 1, 2015, the driver of an S.U.V. didn't yield and crashed into a West Delaware school bus carrying more than 30 students. The bus rolled and sent all the students to the hospital.

"The day of that crash, all those kids were sitting like they were supposed to be sitting and they all survived that crash," said Stickney.

The driver who crashed into the school bus in 2015 was on meth. For that, a judge sentenced Monte Klink to a decade in prison back in February on convictions that include operating while intoxicated.